/**
 * 
 */
let test1 = () => {
    function* helloWorldGenerator() {
        yield 'hello';
        yield 'world';
        return 'ending';
      }
      var hw = helloWorldGenerator();
      console.log(hw.next())
      console.log(hw.next())
      console.log(hw.next())
      console.log(hw.next())
}

test1()